CODEWITHSUNDEEP
indexingelasticsearchlucenesearch-engine
Jack
Jack

Reputation: 5880

How can I use the doc type of ElasticSearch

We know that in ElasticSearch there are Index and doc Type, the query url look like: 192.168.0.10:/index/type. My question is that what can we do by using type, I was thinking can I use another index directly. What's the benefit if I use type instead of a new index? For example, If I wanna create two indices as book and goods. I can create two index such as: /book /goods, also I can create one index with two types: /myindex/book, /myindex/goods.

Upvotes: 0

Views: 251

Answers (1)

Andrei Stefan
Andrei Stefan

Reputation: 52368

Lucene doesn't know about document types, only Elasticsearch uses this. The type name of each document is stored with the document in a metadata field called _type. When we search for documents of a particular type, Elasticsearch simply uses a filter on the _type field to restrict results to documents of that type.

So, types are just a logical representation and a quick of filtering documents. The types belonging to the same index reach the same index and a shard can contain documents from multiple types.

If you use a separate index, instead of separate types your node will hold multiple, smaller shards. The number of shards in a node matters because the resources of the node (memory, CPU, IOPS) are shared between the shards.

Upvotes: 2

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